- var_dump: documentation ( source)
- array_rand: documentation ( source)
<?php
$data = ['First', 'Second', 'Third', 'Fourth', 'Fifth', 'Sixth'];
$temp = $data;
$result = [];
foreach($data as $i=>$item)
{
unset($temp[$i]);
$result[] = [$item, $temp[array_rand($temp)]];
}
var_dump($result);